High-speed ball bearing and ball retainer

Abstract

A high-speed ball bearing includes an outer ring, an inner ring, a plurality of balls, and a ball retainer. The ball retainer includes a plurality of pocket holes for arranging a plurality of balls, an inner circumferential surface of each of the pocket holes have a spherical surface is coaxial to the ball. A gap between an outer circumferential surface of the ball retainer and an inner circumferential surface of the ring is defined as a first gap, and a gap between the pocket hole and the corresponding ball is defined as a second gap. The first gap and the second gap have the following relationship: W 2 =(W 1 −r′)×A.

What is claimed is: 
     
       1. A high-speed ball bearing, comprising:
 an outer ring having an outer ring track surface arranged on an inner circumferential surface of the outer ring, the inner circumferential surface having an outer ring shoulder arranged around a central axis of the ball bearing, wherein a diameter of an inner circumferential surface of the outer ring shoulder is smaller than a diameter of an inner circumferential surface of the outer ring track surface; 
 an inner ring having an inner ring track surface arranged on an outer circumferential surface of the inner ring; 
 a plurality of balls rollably disposed between the outer ring track surface and the inner ring track surface, wherein the balls are spaced apart from each other, and each two of the balls arranged adjacent to each other have the same angle with respect to the central axis of the ball bearing; and 
 a ball retainer arranged between the inner circumferential surface of the outer ring and the outer circumferential surface of the inner ring, the ball retainer including a first ring portion and a second ring portion, wherein the first ring portion and the second ring portion are arranged around the central axis of the ball bearing, a diameter of an outer circumferential surface of the first ring portion is larger than a diameter of an outer circumferential surface of the second ring portion, and a diameter of an inner circumferential surface of the first ring portion is larger than or equal to a diameter of an outer circumferential surface of the second ring portion, wherein the ball retainer includes a plurality of pocket holes that are in an annular arrangement between the first ring portion and the second ring portion, and each two of the pocket holes arranged adjacent to each other have the same angle and are spaced apart from each other with respect to the central axis of the ball bearing, wherein the positions and diameters of the pocket holes correspond to the positions and diameters of the balls, so that the balls are arranged in the pocket holes, and when the balls roll between the outer ring track surface and the inner ring track surface, each adjacent two of the balls are maintained at a distance from each other and have the same angle with respect to the central axis of the ball bearing; 
 wherein the outer circumferential surface of the first ring portion of the ball retainer is adjacent to the inner circumferential surface of the outer ring shoulder, a gap between the first ring portion and the inner circumferential surface of the outer ring shoulder is defined as a first gap, and a gap between the inner circumferential surface of each of the pocket holes and the corresponding ball is defined as a second gap, wherein the first gap and the second gap have the following relationship: 
 W 2 =(W 1 −r′)×A; wherein W 1  represents a width of the first gap; W 2  represents a width of the second gap; r′ is an expansion variable of a radius of the ball retainer generated by the ball bearing being rotated at a predetermined speed; A represents an amplification factor, and wherein when a product value DmN obtained by multiplying the pitch diameter Dm of the high-speed ball bearing and a predetermined allowable rotation speed N is 1,600,000, the amplification factor is within a range of 1.2 to 1.5. 
 
     
     
       2. The high-speed ball bearing according to  claim 1 , wherein each of the pocket holes is formed by a first notch arranged on one side of the first ring portion and a second notch arranged on the second ring portion, wherein in each of the pocket holes, an inner circumferential surface of the first notch and an inner circumferential surface of the second notch face toward each other, the first notch has a first spherical surface arranged on the inner circumferential surface of the first notch, and the second notch has a second spherical surface arranged on the inner circumferential surfaces of the second notch, wherein in each of the pocket holes and the corresponding ball, a center of the ball defines an imaginary spherical surface, a diameter of the imaginary spherical surface is larger than a diameter of the ball, and the first spherical surface and the second spherical surface are arranged on the imaginary spherical surface. 
     
     
       3. The high-speed ball bearing according to  claim 2 , wherein the width of the second gap is within a range of 0.3 mm to 0.5 mm. 
     
     
       4. The high-speed ball bearing according to  claim 3 , wherein the ball retainer and the balls are covered with a lubricating oil during rotation. 
     
     
       5. The high-speed ball bearing according to  claim 3 , wherein the amplification factor is 1.4. 
     
     
       6. The high-speed ball bearing according to  claim 3 , wherein the ball retainer is made of a resin material or a nylon material. 
     
     
       7. A ball retainer for being arranged in a ball bearing that includes a plurality of balls, wherein the ball bearing includes an outer ring and an inner ring, and the outer ring has an outer ring track surface arranged on an inner circumferential surface of the outer ring that has an outer ring shoulder arranged around a central axis of the inner circumferential surface of the outer ring of the ball bearing, wherein a diameter of an inner circumferential surface of the outer ring shoulder is smaller than a diameter of an inner circumferential surface of the outer ring track surface, and the inner ring has an inner ring track surface arranged on an outer circumferential surface of the inner ring, wherein the balls are rollably disposed between the outer ring track surface and the inner ring track surface, the balls are spaced apart from each other, and each two of the balls arranged adjacent to each other have the same angle with respect to the central axis of the ball bearing; the ball retainer comprising;
 a first ring portion and a second ring portion that are configured to be arranged around a central axis of the ball bearing, wherein a diameter of an outer circumferential surface of the first ring portion is larger than a diameter of an outer circumferential surface of the second ring portion, and a diameter of an inner circumferential surface of the first ring portion is larger than or equal to a diameter of an outer circumferential surface of the second ring portion; and 
 a plurality of pocket holes being in an annular arrangement between the first ring portion and the second ring portion, wherein each two of the pocket holes arranged adjacent to each other have the same angle with respect to the central axis of the ball retainer, and are spaced apart from each other, wherein the positions and diameters of the pocket holes correspond to the positions and diameters of the balls, so that the balls are respectively arranged in the pocket holes, and when the balls roll between the outer ring track surface and the inner ring track surface, and each adjacent two of the balls are maintained at a distance from each other and have the same angle with respect to the central axis of the ball bearing; 
 wherein the outer circumferential surface of the first ring portion of the ball retainer is arranged adjacent to the inner circumferential surface of the outer ring shoulder, a gap between the first ring portion and the inner circumferential surface of the outer ring shoulder is defined as a first gap, and a gap between the inner circumferential surface of each of the pocket holes and the corresponding ball is defined as a second gap, wherein the first gap and the second gap have the following relationship: 
 W 2 =(W 1 −f′)×A; wherein W 1  represents a width of the first gap; W 2  represents a width of the second gap; r′ is an expansion variable of a radius of the ball retainer generated by the ball bearing being rotated at a predetermined speed; A represents an amplification factor, and wherein when a product value DmN obtained by multiplying the pitch diameter Dm of the high-speed ball bearing and a predetermined allowable rotation speed N is 1,600,000, the amplification factor is within a range of 1.2 to 1.5. 
 
     
     
       8. The ball retainer according to  claim 7 , wherein each of the pocket holes is formed by a first notch arranged on one side of the first ring portion and a second notch arranged on the second ring portion, wherein in each of the pocket holes, an inner circumferential surface of the first notch and an inner circumferential surface of the second notch face toward each other, the first notch has a first spherical surface arranged on the inner circumferential surface of the first notch, and the second notch has a second spherical surface arranged on the inner circumferential surfaces of the second notch, wherein in each of the pocket holes and the corresponding ball, a center of the ball defines an imaginary spherical surface, and the first spherical surface and the second spherical surface are arranged on the imaginary spherical surface. 
     
     
       9. The ball retainer according to  claim 8 , wherein the width of the second gap is within a range of 0.3 mm to 0.5 mm. 
     
     
       10. The ball retainer according to  claim 8 , wherein the amplification factor is 1.4. 
     
     
       11. The ball retainer according to  claim 8 , wherein the ball retainer is made of a resin material or a nylon material.